Function with OSX; function with spaces in filenames; output status info

I did get this to work, however the results were not what I expected. Anyway, it's a little more verbose and potentially more useful for other dabblers now, so I'd encourage you to accept the pull request. I will be happy to try again if some parameter changes could be suggested to create a better result... my images are fairly high resolution and the current procedure results in exceptionally harsh sharpening.